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Commit | Line | Data |
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b2441318 | 1 | # SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | # |
3 | # Character device configuration | |
4 | # | |
5 | ||
6 | menu "Character devices" | |
7 | ||
bdcffc5a | 8 | source "drivers/tty/Kconfig" |
13ae6645 | 9 | |
24b4b67d | 10 | config TTY_PRINTK |
b24313a8 | 11 | tristate "TTY driver to output user messages via printk" |
4f73bc4d | 12 | depends on EXPERT && TTY |
24b4b67d | 13 | default n |
a7f7f624 | 14 | help |
24b4b67d SP |
15 | If you say Y here, the support for writing user messages (i.e. |
16 | console messages) via printk is available. | |
17 | ||
18 | The feature is useful to inline user messages with kernel | |
19 | messages. | |
20 | In order to use this feature, you should output user messages | |
21 | to /dev/ttyprintk or redirect console to this TTY. | |
22 | ||
23 | If unsure, say N. | |
24 | ||
acef6660 PK |
25 | config TTY_PRINTK_LEVEL |
26 | depends on TTY_PRINTK | |
27 | int "ttyprintk log level (1-7)" | |
28 | range 1 7 | |
29 | default "6" | |
30 | help | |
31 | Printk log level to use for ttyprintk messages. | |
32 | ||
1da177e4 LT |
33 | config PRINTER |
34 | tristate "Parallel printer support" | |
35 | depends on PARPORT | |
a7f7f624 | 36 | help |
1da177e4 LT |
37 | If you intend to attach a printer to the parallel port of your Linux |
38 | box (as opposed to using a serial printer; if the connector at the | |
39 | printer has 9 or 25 holes ["female"], then it's serial), say Y. | |
40 | Also read the Printing-HOWTO, available from | |
4e74eeb2 | 41 | <https://www.tldp.org/docs.html#howto>. |
1da177e4 LT |
42 | |
43 | It is possible to share one parallel port among several devices | |
44 | (e.g. printer and ZIP drive) and it is safe to compile the | |
45 | corresponding drivers into the kernel. | |
46 | ||
47 | To compile this driver as a module, choose M here and read | |
5fb94e9c | 48 | <file:Documentation/admin-guide/parport.rst>. The module will be called lp. |
1da177e4 LT |
49 | |
50 | If you have several parallel ports, you can specify which ports to | |
51 | use with the "lp" kernel command line option. (Try "man bootparam" | |
52 | or see the documentation of your boot loader (lilo or loadlin) about | |
53 | how to pass options to the kernel at boot time.) The syntax of the | |
54 | "lp" command line option can be found in <file:drivers/char/lp.c>. | |
55 | ||
56 | If you have more than 8 printers, you need to increase the LP_NO | |
57 | macro in lp.c and the PARPORT_MAX macro in parport.h. | |
58 | ||
59 | config LP_CONSOLE | |
60 | bool "Support for console on line printer" | |
61 | depends on PRINTER | |
a7f7f624 | 62 | help |
1da177e4 LT |
63 | If you want kernel messages to be printed out as they occur, you |
64 | can have a console on the printer. This option adds support for | |
65 | doing that; to actually get it to happen you need to pass the | |
66 | option "console=lp0" to the kernel at boot time. | |
67 | ||
68 | If the printer is out of paper (or off, or unplugged, or too | |
69 | busy..) the kernel will stall until the printer is ready again. | |
70 | By defining CONSOLE_LP_STRICT to 0 (at your own risk) you | |
71 | can make the kernel continue when this happens, | |
72 | but it'll lose the kernel messages. | |
73 | ||
74 | If unsure, say N. | |
75 | ||
76 | config PPDEV | |
77 | tristate "Support for user-space parallel port device drivers" | |
78 | depends on PARPORT | |
a7f7f624 | 79 | help |
1da177e4 LT |
80 | Saying Y to this adds support for /dev/parport device nodes. This |
81 | is needed for programs that want portable access to the parallel | |
82 | port, for instance deviceid (which displays Plug-and-Play device | |
83 | IDs). | |
84 | ||
85 | This is the parallel port equivalent of SCSI generic support (sg). | |
86 | It is safe to say N to this -- it is not needed for normal printing | |
87 | or parallel port CD-ROM/disk support. | |
88 | ||
89 | To compile this driver as a module, choose M here: the | |
90 | module will be called ppdev. | |
91 | ||
92 | If unsure, say N. | |
93 | ||
31610434 | 94 | config VIRTIO_CONSOLE |
7721c494 | 95 | tristate "Virtio console" |
9f30eb29 | 96 | depends on TTY |
31610434 | 97 | select HVC_DRIVER |
9f30eb29 | 98 | select VIRTIO |
7721c494 | 99 | help |
ecda85e7 | 100 | Virtio console for use with hypervisors. |
7721c494 | 101 | |
fb08bd27 AS |
102 | Also serves as a general-purpose serial device for data |
103 | transfer between the guest and host. Character devices at | |
104 | /dev/vportNpn will be created when corresponding ports are | |
105 | found, where N is the device number and n is the port number | |
106 | within that device. If specified by the host, a sysfs | |
107 | attribute called 'name' will be populated with a name for | |
108 | the port which can be used by udev scripts to create a | |
109 | symlink to the device. | |
31610434 | 110 | |
fe9e8d53 SR |
111 | config IBM_BSR |
112 | tristate "IBM POWER Barrier Synchronization Register support" | |
113 | depends on PPC_PSERIES | |
114 | help | |
115 | This devices exposes a hardware mechanism for fast synchronization | |
116 | of threads across a large system which avoids bouncing a cacheline | |
117 | between several cores on a system | |
118 | ||
43a1dd9b SJS |
119 | config POWERNV_OP_PANEL |
120 | tristate "IBM POWERNV Operator Panel Display support" | |
121 | depends on PPC_POWERNV | |
122 | default m | |
123 | help | |
124 | If you say Y here, a special character device node, /dev/op_panel, | |
125 | will be created which exposes the operator panel display on IBM | |
126 | Power Systems machines with FSPs. | |
127 | ||
128 | If you don't require access to the operator panel display from user | |
129 | space, say N. | |
130 | ||
131 | If unsure, say M here to build it as a module called powernv-op-panel. | |
132 | ||
1da177e4 LT |
133 | source "drivers/char/ipmi/Kconfig" |
134 | ||
1da177e4 LT |
135 | config DS1620 |
136 | tristate "NetWinder thermometer support" | |
137 | depends on ARCH_NETWINDER | |
138 | help | |
139 | Say Y here to include support for the thermal management hardware | |
140 | found in the NetWinder. This driver allows the user to control the | |
141 | temperature set points and to read the current temperature. | |
142 | ||
143 | It is also possible to say M here to build it as a module (ds1620) | |
144 | It is recommended to be used on a NetWinder, but it is not a | |
145 | necessity. | |
146 | ||
147 | config NWBUTTON | |
148 | tristate "NetWinder Button" | |
149 | depends on ARCH_NETWINDER | |
a7f7f624 | 150 | help |
1da177e4 LT |
151 | If you say Y here and create a character device node /dev/nwbutton |
152 | with major and minor numbers 10 and 158 ("man mknod"), then every | |
153 | time the orange button is pressed a number of times, the number of | |
154 | times the button was pressed will be written to that device. | |
155 | ||
156 | This is most useful for applications, as yet unwritten, which | |
157 | perform actions based on how many times the button is pressed in a | |
158 | row. | |
159 | ||
160 | Do not hold the button down for too long, as the driver does not | |
161 | alter the behaviour of the hardware reset circuitry attached to the | |
162 | button; it will still execute a hard reset if the button is held | |
163 | down for longer than approximately five seconds. | |
164 | ||
165 | To compile this driver as a module, choose M here: the | |
166 | module will be called nwbutton. | |
167 | ||
168 | Most people will answer Y to this question and "Reboot Using Button" | |
169 | below to be able to initiate a system shutdown from the button. | |
170 | ||
171 | config NWBUTTON_REBOOT | |
172 | bool "Reboot Using Button" | |
173 | depends on NWBUTTON | |
174 | help | |
175 | If you say Y here, then you will be able to initiate a system | |
176 | shutdown and reboot by pressing the orange button a number of times. | |
177 | The number of presses to initiate the shutdown is two by default, | |
178 | but this can be altered by modifying the value of NUM_PRESSES_REBOOT | |
179 | in nwbutton.h and recompiling the driver or, if you compile the | |
180 | driver as a module, you can specify the number of presses at load | |
181 | time with "insmod button reboot_count=<something>". | |
182 | ||
183 | config NWFLASH | |
184 | tristate "NetWinder flash support" | |
185 | depends on ARCH_NETWINDER | |
a7f7f624 | 186 | help |
1da177e4 LT |
187 | If you say Y here and create a character device /dev/flash with |
188 | major 10 and minor 160 you can manipulate the flash ROM containing | |
189 | the NetWinder firmware. Be careful as accidentally overwriting the | |
190 | flash contents can render your computer unbootable. On no account | |
191 | allow random users access to this device. :-) | |
192 | ||
193 | To compile this driver as a module, choose M here: the | |
194 | module will be called nwflash. | |
195 | ||
196 | If you're not sure, say N. | |
197 | ||
844dd05f MB |
198 | source "drivers/char/hw_random/Kconfig" |
199 | ||
1da177e4 LT |
200 | config DTLK |
201 | tristate "Double Talk PC internal speech card support" | |
eeca7a36 | 202 | depends on ISA |
1da177e4 LT |
203 | help |
204 | This driver is for the DoubleTalk PC, a speech synthesizer | |
4e74eeb2 | 205 | manufactured by RC Systems (<https://www.rcsys.com/>). It is also |
1da177e4 LT |
206 | called the `internal DoubleTalk'. |
207 | ||
208 | To compile this driver as a module, choose M here: the | |
209 | module will be called dtlk. | |
210 | ||
ef141a0b SN |
211 | config XILINX_HWICAP |
212 | tristate "Xilinx HWICAP Support" | |
7ade8495 | 213 | depends on MICROBLAZE |
ef141a0b SN |
214 | help |
215 | This option enables support for Xilinx Internal Configuration | |
216 | Access Port (ICAP) driver. The ICAP is used on Xilinx Virtex | |
217 | FPGA platforms to partially reconfigure the FPGA at runtime. | |
218 | ||
219 | If unsure, say N. | |
220 | ||
1da177e4 LT |
221 | config APPLICOM |
222 | tristate "Applicom intelligent fieldbus card support" | |
223 | depends on PCI | |
a7f7f624 | 224 | help |
1da177e4 LT |
225 | This driver provides the kernel-side support for the intelligent |
226 | fieldbus cards made by Applicom International. More information | |
227 | about these cards can be found on the WWW at the address | |
4e74eeb2 | 228 | <https://www.applicom-int.com/>, or by email from David Woodhouse |
1da177e4 LT |
229 | <dwmw2@infradead.org>. |
230 | ||
231 | To compile this driver as a module, choose M here: the | |
232 | module will be called applicom. | |
233 | ||
234 | If unsure, say N. | |
235 | ||
236 | config SONYPI | |
65929215 | 237 | tristate "Sony Vaio Programmable I/O Control Device support" |
57dcf020 | 238 | depends on X86_32 && PCI && INPUT |
a7f7f624 | 239 | help |
1da177e4 LT |
240 | This driver enables access to the Sony Programmable I/O Control |
241 | Device which can be found in many (all ?) Sony Vaio laptops. | |
242 | ||
243 | If you have one of those laptops, read | |
9e1cbede | 244 | <file:Documentation/admin-guide/laptops/sonypi.rst>, and say Y or M here. |
1da177e4 LT |
245 | |
246 | To compile this driver as a module, choose M here: the | |
247 | module will be called sonypi. | |
248 | ||
09762516 YY |
249 | config GPIO_TB0219 |
250 | tristate "TANBAC TB0219 GPIO support" | |
bef1f402 | 251 | depends on TANBAC_TB022X |
584e1236 | 252 | select GPIO_VR41XX |
1da177e4 | 253 | |
1da177e4 LT |
254 | source "drivers/char/pcmcia/Kconfig" |
255 | ||
256 | config MWAVE | |
257 | tristate "ACP Modem (Mwave) support" | |
4f73bc4d | 258 | depends on X86 && TTY |
1da177e4 | 259 | select SERIAL_8250 |
a7f7f624 | 260 | help |
1da177e4 LT |
261 | The ACP modem (Mwave) for Linux is a WinModem. It is composed of a |
262 | kernel driver and a user level application. Together these components | |
263 | support direct attachment to public switched telephone networks (PSTNs) | |
264 | and support selected world wide countries. | |
265 | ||
266 | This version of the ACP Modem driver supports the IBM Thinkpad 600E, | |
267 | 600, and 770 that include on board ACP modem hardware. | |
268 | ||
269 | The modem also supports the standard communications port interface | |
270 | (ttySx) and is compatible with the Hayes AT Command Set. | |
271 | ||
272 | The user level application needed to use this driver can be found at | |
273 | the IBM Linux Technology Center (LTC) web site: | |
274 | <http://www.ibm.com/linux/ltc/>. | |
275 | ||
276 | If you own one of the above IBM Thinkpads which has the Mwave chipset | |
277 | in it, say Y. | |
278 | ||
279 | To compile this driver as a module, choose M here: the | |
280 | module will be called mwave. | |
281 | ||
282 | config SCx200_GPIO | |
283 | tristate "NatSemi SCx200 GPIO Support" | |
284 | depends on SCx200 | |
7a8e2a5e | 285 | select NSC_GPIO |
1da177e4 LT |
286 | help |
287 | Give userspace access to the GPIO pins on the National | |
288 | Semiconductor SCx200 processors. | |
289 | ||
290 | If compiled as a module, it will be called scx200_gpio. | |
291 | ||
7a8e2a5e JC |
292 | config PC8736x_GPIO |
293 | tristate "NatSemi PC8736x GPIO Support" | |
3369465e | 294 | depends on X86_32 && !UML |
7a8e2a5e JC |
295 | default SCx200_GPIO # mostly N |
296 | select NSC_GPIO # needed for support routines | |
297 | help | |
298 | Give userspace access to the GPIO pins on the National | |
299 | Semiconductor PC-8736x (x=[03456]) SuperIO chip. The chip | |
300 | has multiple functional units, inc several managed by | |
301 | hwmon/pc87360 driver. Tested with PC-87366 | |
302 | ||
303 | If compiled as a module, it will be called pc8736x_gpio. | |
304 | ||
305 | config NSC_GPIO | |
306 | tristate "NatSemi Base GPIO Support" | |
699352c3 | 307 | depends on X86_32 |
7a8e2a5e JC |
308 | # selected by SCx200_GPIO and PC8736x_GPIO |
309 | # what about 2 selectors differing: m != y | |
310 | help | |
311 | Common support used (and needed) by scx200_gpio and | |
312 | pc8736x_gpio drivers. If those drivers are built as | |
313 | modules, this one will be too, named nsc_gpio | |
314 | ||
8d7dc56e RD |
315 | config DEVMEM |
316 | bool "/dev/mem virtual device support" | |
317 | default y | |
318 | help | |
319 | Say Y here if you want to support the /dev/mem device. | |
320 | The /dev/mem device is used to access areas of physical | |
321 | memory. | |
322 | When in doubt, say "Y". | |
323 | ||
8d7dc56e RD |
324 | config NVRAM |
325 | tristate "/dev/nvram support" | |
326 | depends on X86 || HAVE_ARCH_NVRAM_OPS | |
327 | default M68K || PPC | |
a7f7f624 | 328 | help |
8d7dc56e RD |
329 | If you say Y here and create a character special file /dev/nvram |
330 | with major number 10 and minor number 144 using mknod ("man mknod"), | |
331 | you get read and write access to the non-volatile memory. | |
332 | ||
333 | /dev/nvram may be used to view settings in NVRAM or to change them | |
334 | (with some utility). It could also be used to frequently | |
335 | save a few bits of very important data that may not be lost over | |
336 | power-off and for which writing to disk is too insecure. Note | |
337 | however that most NVRAM space in a PC belongs to the BIOS and you | |
338 | should NEVER idly tamper with it. See Ralf Brown's interrupt list | |
339 | for a guide to the use of CMOS bytes by your BIOS. | |
340 | ||
341 | This memory is conventionally called "NVRAM" on PowerPC machines, | |
342 | "CMOS RAM" on PCs, "NVRAM" on Ataris and "PRAM" on Macintoshes. | |
343 | ||
344 | To compile this driver as a module, choose M here: the | |
345 | module will be called nvram. | |
346 | ||
8d7dc56e RD |
347 | config DEVPORT |
348 | bool "/dev/port character device" | |
349 | depends on ISA || PCI | |
350 | default y | |
351 | help | |
352 | Say Y here if you want to support the /dev/port device. The /dev/port | |
353 | device is similar to /dev/mem, but for I/O ports. | |
354 | ||
1da177e4 LT |
355 | config HPET |
356 | bool "HPET - High Precision Event Timer" if (X86 || IA64) | |
357 | default n | |
358 | depends on ACPI | |
359 | help | |
360 | If you say Y here, you will have a miscdevice named "/dev/hpet/". Each | |
361 | open selects one of the timers supported by the HPET. The timers are | |
3cb2fccc | 362 | non-periodic and/or periodic. |
1da177e4 | 363 | |
1da177e4 LT |
364 | config HPET_MMAP |
365 | bool "Allow mmap of HPET" | |
366 | default y | |
367 | depends on HPET | |
368 | help | |
369 | If you say Y here, user applications will be able to mmap | |
370 | the HPET registers. | |
371 | ||
3d035f58 PB |
372 | config HPET_MMAP_DEFAULT |
373 | bool "Enable HPET MMAP access by default" | |
374 | default y | |
375 | depends on HPET_MMAP | |
376 | help | |
1da177e4 LT |
377 | In some hardware implementations, the page containing HPET |
378 | registers may also contain other things that shouldn't be | |
3d035f58 PB |
379 | exposed to the user. This option selects the default (if |
380 | kernel parameter hpet_mmap is not set) user access to the | |
381 | registers for applications that require it. | |
1da177e4 | 382 | |
1da177e4 LT |
383 | config HANGCHECK_TIMER |
384 | tristate "Hangcheck timer" | |
abf3ea1b | 385 | depends on X86 || IA64 || PPC64 || S390 |
1da177e4 LT |
386 | help |
387 | The hangcheck-timer module detects when the system has gone | |
388 | out to lunch past a certain margin. It can reboot the system | |
389 | or merely print a warning. | |
390 | ||
fbd8ae10 DS |
391 | config UV_MMTIMER |
392 | tristate "UV_MMTIMER Memory mapped RTC for SGI UV" | |
393 | depends on X86_UV | |
394 | default m | |
395 | help | |
396 | The uv_mmtimer device allows direct userspace access to the | |
397 | UV system timer. | |
398 | ||
1da177e4 LT |
399 | source "drivers/char/tpm/Kconfig" |
400 | ||
1a80ba88 | 401 | config TELCLOCK |
03154a27 | 402 | tristate "Telecom clock driver for ATCA SBC" |
65929215 | 403 | depends on X86 |
1a80ba88 MG |
404 | default n |
405 | help | |
03154a27 MG |
406 | The telecom clock device is specific to the MPCBL0010 and MPCBL0050 |
407 | ATCA computers and allows direct userspace access to the | |
408 | configuration of the telecom clock configuration settings. This | |
409 | device is used for hardware synchronization across the ATCA backplane | |
410 | fabric. Upon loading, the driver exports a sysfs directory, | |
411 | /sys/devices/platform/telco_clock, with a number of files for | |
412 | controlling the behavior of this hardware. | |
1a80ba88 | 413 | |
61d48c2c MS |
414 | source "drivers/s390/char/Kconfig" |
415 | ||
7051924f EB |
416 | source "drivers/char/xillybus/Kconfig" |
417 | ||
873c38a4 TH |
418 | config ADI |
419 | tristate "SPARC Privileged ADI driver" | |
420 | depends on SPARC64 | |
421 | default m | |
422 | help | |
423 | SPARC M7 and newer processors utilize ADI (Application Data | |
424 | Integrity) to version and protect memory. This driver provides | |
425 | read/write access to the ADI versions for privileged processes. | |
426 | This feature is also known as MCD (Memory Corruption Detection) | |
427 | and SSM (Silicon Secured Memory). Intended consumers of this | |
428 | driver include crash and makedumpfile. | |
429 | ||
39a8883a TT |
430 | config RANDOM_TRUST_CPU |
431 | bool "Trust the CPU manufacturer to initialize Linux's CRNG" | |
23ae0c17 | 432 | depends on ARCH_RANDOM |
39a8883a TT |
433 | default n |
434 | help | |
435 | Assume that CPU manufacturer (e.g., Intel or AMD for RDSEED or | |
436 | RDRAND, IBM for the S390 and Power PC architectures) is trustworthy | |
437 | for the purposes of initializing Linux's CRNG. Since this is not | |
438 | something that can be independently audited, this amounts to trusting | |
439 | that CPU manufacturer (perhaps with the insistence or mandate | |
440 | of a Nation State's intelligence or law enforcement agencies) | |
441 | has not installed a hidden back door to compromise the CPU's | |
9b254366 KC |
442 | random number generation facilities. This can also be configured |
443 | at boot with "random.trust_cpu=on/off". | |
428826f5 HYW |
444 | |
445 | config RANDOM_TRUST_BOOTLOADER | |
446 | bool "Trust the bootloader to initialize Linux's CRNG" | |
447 | help | |
448 | Some bootloaders can provide entropy to increase the kernel's initial | |
449 | device randomness. Say Y here to assume the entropy provided by the | |
450 | booloader is trustworthy so it will be added to the kernel's entropy | |
451 | pool. Otherwise, say N here so it will be regarded as device input that | |
c8175bd1 | 452 | only mixes the entropy pool. |
9e1b28b7 RD |
453 | |
454 | endmenu |